It might further be expected, that here also we might find two other species 

 0. curriei (Coquillet) an American species, already found in England, and 0. detritus 

 (Haliday). Both species were found. As almost all my studies hitherto had been 

 restricted to Seeland, with some small trips to the southern islands, it was of in- 

 terest to become acquainted with the mosquito fauna of Jutland. 



My time now being occupied with the preparation of the work for print, I 

 requested Mr. Kryger, whom I know as a very skilled observer, to follow the develop- 

 ment of the mosquito life in the brackish-water pools near Copenhagen, and on a 

 journey in Jutland to study mosquito life there. Mr. Kryger was also to gather 

 information with regard to the occurrence of Anopheles in stables. 



Staeger indicates 15 Culicida?, of which one C. nigripes must unquestionably 

 be cancelled. Thirteen new species have now been found for our fauna, this 

 now consisting of twenty-five species. The new species are: Ochlerotatus curriei 

 (Coquillet), 0. lutescens (F.), 0. excrucians (YVTk.), 0. detritus (Haliday), 0. punctor 

 (Kirby), 0. prodotes (Dyar), 0. rusticus (Rossi), 0. diantcvus (Howard, Dyar and 

 Knab), 0. sticticus (Meig.), Tceniorynchus Richardii (Ficalbi), Culicella morsitans 

 (Theobald), Culex ciliaris Linne, C. nigritulus Zetterstedt. Three of the species were 

 new for Europe. Of these thirteen species I have myself found the twelve; 0. stic- 

 ticus has been brought me by Mr. Kryger from the western part of Jutland. Of 

 the twenty-five species the twenty have been hatched from larva-. Most of these 

 larvse have hitherto only been very badly described or were wholly unknown. 



It will of course be understood that the exploration has taken much more 

 time than I had thought, when I began. To a much higher degree than I had first 

 thought the work had to be systematic. Gradually I understood that a redescrip- 

 tion of the American species was necessary, that all the species of the nemorosus- 

 communis group should be redescribed, and that all the larva? had to be described 

 and carefully delineated. It was very much against my wishes that I was forced 

 into scientific work to which I have always been a stranger. I soon learned that 

 my descriptions of the imagines would be best if I followed the descriptions by 

 Howard, Dyar and Knar as closely as possible. Everywhere where it has been 

 possible I have therefore followed the descriptions of imagines by these authors. 

 Reference only to the work of Howard, Dyar and Knar was not possible, be- 

 cause slighter differences could almost always be detected. With regard to the 

 description of larvae the case is different; these are always wholly original, and it 

 will be understood that new characters have been used and the older ones esti- 

 mated in a way differing from that of earlier authors. 



As stated above: What I had intended should be the main points of the work: 

 the statements that almost all our mosquitoes only possess one single generation, 

 and that the eggs of the Aedini are laid singly and not in eggboats, have now been 

 made by others. Now one of the main results of the exploration, a result which 

 was not intended, when the exploration began, is probably, that the North- and Cen- 

 tral-European mosquitoes should now be recognisable in the larva and imago stage; 



